id:A128553 - OEIS Search Results

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Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3].

+0
4

1, 5, 18, 58, 155, 383, 867, 1860, 3782, 7409, 13989, 25683, 45905, 80262, 137453, 231269, 382689, 624061, 1003787, 1594796, 2504587, 3892100, 5988403, 9129707, 13798792, 20688367, 30781988, 45473815, 66723042, 97276842, 140959603 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=polcoeff(prod(j=n+4, 2n+6, 1-q^j)/prod(j=1, n+3, 1-q^j), 3n+9, q)`
	CROSSREFS	`Cf. A128545; A128552, A128554.` `Sequence in context: A001793 A093374 A000745 this_sequence A000340 A034567 A133648` `Adjacent sequences: A128550 A128551 A128552 this_sequence A128554 A128555 A128556`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 10 2007`

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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